Electronics Forum | Tue Jan 23 10:45:40 EST 2007 | saaitk
We have used 2 lubricants in the past. The first was Isopropal alcohol, this has issues with regard to H&S but can be quite effective. Most of our product at the time we encountered this problem were washed in a semi aqueous system before shipping. A
Electronics Forum | Fri Apr 30 12:34:12 EDT 2004 | Bryan She
Hello all, these days I've met an OSP board testability issue. 1.OSP board 2.Solder paste:Kester R244 no clean paste 3.Print solder paste on test pad. Issue: There's brone(light yellow)flux residue on test pad,and the probe can't penetrate the residu
Electronics Forum | Tue Aug 03 18:04:28 EDT 2004 | kmakiya
Thanks for the info. I have looked at an EVA mesh that will pass esd test as well as exposure to w/s flux and hot water. Stainless is great but the the softer material is what I want. I want to get samples of the thermoplastics from Mcmaster. Thanks
Electronics Forum | Thu Feb 14 23:37:38 EST 2008 | operator
That is bizarre. I would have to say that you need to do a test on the PCB to test solderability with an iron like mentioned before. If you don't find that the pads are contaminated or masked over lightly and the pads do take solder effortlessly, you
Electronics Forum | Sun May 02 16:57:09 EDT 2004 | davef
You're correct. We prefer to probe solder, rather than copper, because the solder absorbs the impact of the probe better than copper and so, helps preserve the life of the probe. Beyond that, OSP has a limited "shelf life". If the OSP is not coate
Electronics Forum | Mon Aug 11 10:47:40 EDT 2008 | dphilbrick
Sounds like bad BGA's to me. I suspect this is rare but you can get black pad on the BGA attach pads just like you get them on a PCB. Do you have un-processed BGA's?(still in package) I would have one tested (not by the manufacturer)!
Electronics Forum | Mon Jan 23 20:58:08 EST 2006 | davef
J-STD-003B - Solderability Tests for Printed Boards is currently a "Working Draft". Look here: http://www.ipc.org/status.asp
Electronics Forum | Fri Jul 10 07:34:00 EDT 2020 | elijah
From the poor bonding strength of the board, the surface quality problems of the board are divided into: 1. The cleanliness of the board surface; 2. The problem of micro graphite (or surface energy) on the surface. PCB circuit board proofing Youke bo
Electronics Forum | Wed Dec 13 14:17:26 EST 2017 | emeto
For the ovens you run the profiler and you compare graphs. For the AOI you should run these golden boards(boards that you keep for AOI test - might have intentionally implemented defects) once in a while and make sure you are getting the same results
Electronics Forum | Wed Feb 04 21:06:07 EST 2009 | shan
I'm looking for test labs in Taiwan that are capable of performing ionic contamination testing on small to medium sized SMT boards. I'm interested in both ion chromatography and ROSE test methodologies. Is anyone aware of any labs performing contami
